Part of the Yanmar Repair Manuals.
When a 3TNV or 4TNV diesel cranks hard on a cold morning or trails smoke halfway through a load cycle, the fault usually lives in fuel, compression, or cooling, and this Yanmar service manual walks all three end to end. Across 280 pages it covers specifications, periodic inspection and adjustment, troubleshooting, complete engine disassembly and reassembly, the lubrication and cooling systems, the fuel injection pump and governor, turbocharger service, starting motor, alternator, and electric wiring for the 3TNV and 4TNV series engines fitted to mini-excavators, skid steer loaders, and other industrial machines.
Service standards plus a full tightening torque table for bolts and nuts back up the procedures, so you can measure, judge, and reassemble to Yanmar's own figures (publication M9961-02E050).
As a PDF download it goes wherever the machine is: a laptop in the shop or a phone propped on the frame, right beside the engine that quit.
What's Inside This Manual
| System | Pages | Key Topics |
|---|---|---|
| Main Page | 1-16 | |
| General | 17-37 | Engine Nomenclature, Specifications, Fuel Oil, Lubricating Oil and Cooling Water, Engine External Views, Structural Description |
| Inspection Adjustment | 38-68 | Periodic Maintenance Schedule, Periodic Inspection and Maintenance Procedure, No-Load Maximum or Minimum Speed Adjustment, Sensor Inspection, Cooling Water System Leak Check |
| Troubleshooting | 69-74 | Excessively Exhaust Smoke, White Smoke Generation, Sudden Oil Decrease |
| Disassembly, Inspection and Reassembly of Engines | 75-123 | Complete Disassembly and Reassembly (Introduction, Special Service Tools, Precautions Before and During Reassembly, Operation), Cylinder Head: Disassembly |
| Lubrication System | 124-127 | Lubrication System Diagram, Trochoid Pump Components, Disassembly, Servicing Points, Parts Inspection and Measurement (Trochoid Pump Inspection and Measurement) |
| Cooling System | 128-129 | Cooling Water System, Cooling Water Pump Components, Disassembly, Servicing Points |
| Fuel Injection Pump/Governor | 130-133 | Introduction, Fuel Injection Pump (Fuel System Diagram, External View and Components, Disassembly Procedure, Assembly Procedure, Servicing Points) |
| Turbocharger: Disassembly, Inspection and Reassembly | 134-155 | Structure and Functions, Service Standards and Tightening Torque, Periodic Inspection Procedure, Disassembly Procedure, Washing and Inspection Procedure, Reassembly Procedure |
| Starting Motor | 156-191 | Specifications, Components, Troubleshooting, Disassembly Procedure, Inspection and Maintenance, Service Standards |
| Alternator | 192-195 | Components, Specifications, Wiring Diagram, Standard Output Characteristics, Inspection, Troubleshooting |
| Electric Wiring | 196-200 | Electric Wiring Diagram, Alternator Wiring Precautions, Starter Wiring Precautions, Current Limiter Wiring Precautions, Section Area and Resistance of Electric Wire |
| Service Standards | 201-211 | Engine Tuning, Cylinder Head, Gear Train and Camshaft, Cylinder Block, Lubricating Oil System (Trochoid Pump) |
| Tightening Torque for Bolts and Nuts | 212-280 | Tightening Torques for Main Bolts and Nuts, Tightening Torques for Standard Bolts and Nuts |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| 3TNV82A to 4TNV106(T) | ||
| Fuel filter element tightening torque | 20~24 N·m (2.0~2.4 kgf·m) | p. 35 |
| MP4, MP2 | ||
| Nut, fuel limiter torque | 19.6~21.6 Nm | p. 276 |
| Angleich complete torque | 25~29 Nm | p. 276 |
